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Twelve - inch scale in case, by "Donkin, London"

Twelve - inch scale in case, by "Donkin, London"

Stand for scale used in Foucault's Gyroscope Demonstration

Stand for scale used in Foucault's Gyroscope Demonstration

Linear scale and folding square with quadrant arc

Linear scale and folding square with quadrant arc

1757
Triangular ivory scale

Triangular ivory scale

Weighing scales, 30lb capacity, by W & T Avery, Birmingham, c.1960, modified to operate as spring tension tester for BR Mark 7 single action slam carriage locks, used at Selhurst Depot until 1992.

Weighing scales

1960
Holtzapffel's "Library sketching or pocket-book scale", with descriptive leaflet, date 1849

Holtzapffel's "Library sketching or pocket-book scale"

1849